163004140561 has 4 divisors (see below), whose sum is σ = 163005329124. Its totient is φ = 163002952000.

The previous prime is 163004140549. The next prime is 163004140577. The reversal of 163004140561 is 165041400361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165041400361 = 67 ⋅2463304483.

It can be written as a sum of positive squares in 2 ways, for example, as 39209940225 + 123794200336 = 198015^2 + 351844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163004140561 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163004140531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356980 + ... + 673381.

It is an arithmetic number, because the mean of its divisors is an integer number (40751332281).

Almost surely, 2^163004140561 is an apocalyptic number.

It is an amenable number.

163004140561 is a deficient number, since it is larger than the sum of its proper divisors (1188563).

163004140561 is a wasteful number, since it uses less digits than its factorization.

163004140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188562.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 163004140561 in words is "one hundred sixty-three billion, four million, one hundred forty thousand, five hundred sixty-one".